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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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19aeb5a65f
This patch fixes a regression in the patch "GFS2: Remember directory
insert point", commit 2b47dad866.
The problem had to do with the rename function: The function found
space for the new dirent, and remembered that location. But then the
old dirent was removed, which often moved the eligible location for
the renamed dirent. Putting the new dirent at the saved location
caused file system corruption.
This patch adds a new "save_loc" variable to struct gfs2_diradd.
If 1, the dirent location is saved. If 0, the dirent location is not
saved and the buffer_head is released as per previous behavior.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#ifndef __DIR_DOT_H__
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#define __DIR_DOT_H__
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#include <linux/dcache.h>
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#include <linux/crc32.h>
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struct inode;
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struct gfs2_inode;
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struct gfs2_inum;
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struct buffer_head;
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struct gfs2_dirent;
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struct gfs2_diradd {
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unsigned nr_blocks;
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struct gfs2_dirent *dent;
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struct buffer_head *bh;
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int save_loc;
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};
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extern struct inode *gfs2_dir_search(struct inode *dir,
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const struct qstr *filename,
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bool fail_on_exist);
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extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
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const struct gfs2_inode *ip);
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extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
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const struct gfs2_inode *ip, struct gfs2_diradd *da);
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static inline void gfs2_dir_no_add(struct gfs2_diradd *da)
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{
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if (da->bh)
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brelse(da->bh);
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da->bh = NULL;
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}
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extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
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extern int gfs2_dir_read(struct inode *inode, struct dir_context *ctx,
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struct file_ra_state *f_ra);
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extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
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const struct gfs2_inode *nip, unsigned int new_type);
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extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);
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extern int gfs2_diradd_alloc_required(struct inode *dir,
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const struct qstr *filename,
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struct gfs2_diradd *da);
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extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
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struct buffer_head **bhp);
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extern void gfs2_dir_hash_inval(struct gfs2_inode *ip);
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static inline u32 gfs2_disk_hash(const char *data, int len)
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{
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return crc32_le((u32)~0, data, len) ^ (u32)~0;
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}
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static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
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{
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name->name = fname;
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name->len = strlen(fname);
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name->hash = gfs2_disk_hash(name->name, name->len);
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}
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/* N.B. This probably ought to take inum & type as args as well */
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static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
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{
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dent->de_inum.no_addr = cpu_to_be64(0);
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dent->de_inum.no_formal_ino = cpu_to_be64(0);
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dent->de_hash = cpu_to_be32(name->hash);
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dent->de_rec_len = cpu_to_be16(reclen);
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dent->de_name_len = cpu_to_be16(name->len);
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dent->de_type = cpu_to_be16(0);
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memset(dent->__pad, 0, sizeof(dent->__pad));
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memcpy(dent + 1, name->name, name->len);
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}
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extern struct qstr gfs2_qdot;
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extern struct qstr gfs2_qdotdot;
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#endif /* __DIR_DOT_H__ */
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